I have an alternative to Todd's solution, which may work perfectly well for you by the way, but you'll need a few more steps to make a Top 10 Summary:
1) In the Table window, create a sort on the limit field. Set it to be descending.
2) Create a filter; let's call it Top 10 Limits. You can leave the formula blank. Go to the Advanced tab. In Duplicate Handling, select "Don't care about duplicates.". Now set the Row Count Limit to First 10 rows.
3) In your Summary set the filter to Top 10 Limits, and turn off the total line. Set the limit as the measure field, client-nr as key, client-name as item, and OK all this and view the summary.
4) Now double click the client-nr, and on the Sorting tab set the Measure to Limit and set it to descending.
Now you'll have a summary displaying only those 10 records, without an "All Others" row.
Does this accomplish what you need?